Go to project settings --> input, then in size put 20 (I don't remember how many inputs are there, so just put 20) then there will be like 4-5 jump inputs, change the last one to "PickUp" and in positive key put tab.

That's also in the documentation of the package.

P.S Use google translate

jjk220@ Congratz

I really like this package, I was thinking on making it multiplayer compatible because the gameplay is fun and smooth, btw I wouldn't recomment it for newbies as the creator is not active anymore.